Yarn tensioning for loom shuttles



. 1,595,708 G. M. CHENEY YARN TENSIONING FOR'LOOM sH'p TLEs Aug. 10 1926.

i ed March 26.- 1925]. 1

'F v 1 ,9 7 4 ii? l a mi Patented Aug. 10, 1926.

UNITED STATES PATENT OFFICE.

GEORGE M. CHENEY, 0F SOUTHBRIDGE, MASSACHUSETTS, ASSIGNOR TO LITCHFIELD SHUTTLE COMPANY, OF SOUTHBRIDGE, DIASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

YARN 'rnnsronrne Foe LOOM SHUTTLES.

Application filed March 26, 1925. SeriaI No. 18,58 1.

This invention relates to loom shuttles, and is more particularly concerned with the provision of means for effecting the desired tensioning of the yarn as it is being delivered from theshuttle in the weaving operation. I

W ith this end in view the invention comprises, in combination with the channeled forepart of a. shuttle, tensioning means 10-' catcd in said channel and comprising'opposed yarn-engaging members arranged to receive theyarn from the threading plates or members and to exert a conjoint yielding pressure upon the yarn passing. between them to the shuttle outlet or delivery eye, A further feature of the invention comprises any conveniently arranged means for readily adjusting the tensioning action of the opposed tensioning members upon the interposed yarn. These and other features of the invention will be particularly described in the followingspecification and will be defined in the claims hereto annexed.

In the accompanying drawings I have illustrated two specifically diiierent forms of construction embodying the principles of this invention, in which: 4

Figure l is aplan view of the forward end or forepart of the shuttle equipped with my improved tensioning means.

Figure 2 is a transverse vertical section, as viewed on the plane crossed by the arrows in Figure 1.

Figure 3 is a longitudinal sectional view through the forepart of the shuttle, illustrating the same form of device as in Fig ures 1 and 2. 7

Figures 4, 5 and 6 are corresponding views illustrating a modified construction of tensioning means embodying the inven tion.

For the purposes of illustration I have shown a loom shuttle 1, whose forepart is provided with a longitudinal medial channel indicated at 2, which at its forward end communicates with a lateral or outlet passage leading to the delivery eye or yarnoutlet 5, in the side of the shuttle.

The threading plates 3 and at overhang the shuttle in such a way as to guide he yarn into the medial channel and outlet passage, the tensioning means being so arranged that, as the yarn is guided into the medial channel it is also inserted into the tensioning device which retains it'there, as will be presently described. a

In the throat or rear portion, of the medial channel 2 is located the 'tensioning means which comprises a basemember 6, pref erably ofcylindrical form, provided with an upstanding yarn-engaging pin 8 are ranged to one side of the center. The opposite side of the base is slotted to permit the insertion of a movable yarn-engagihg member 7 whichis pivoted upona transverse fulcral pin 7 driven transversely through the slotted portion of the base member. As indicated in Figures 1 and 2, the opposed faces of the yarn-engaging tensioning members, instead of being flat, are formed.

so that one projects sli htly into the other. To effect this partlal nter-matching of the two members the inside or yarn-engaging face of the movable member 7'is somewhat concaved to partially embrace the convex opposing face of the other member 8. Fur thermore, the upper ends of both members are bevelled or sloo'ed inwardlv to uide the yarn in between the two tensioning members when the yarn is threaded into the'shuttle. It will also be observed that'the' vertical edges of the conca'vedportion of the mov able tensioning member 7 are cut away to leave overhanging hook-like ledges 7 which project beyond or overhang the inner face of this member and, therefore, act as stops or shouldersv to prevent the accidental escape of yarn from its normal and proper position between the two tensioning members.

Them ov-able or pivotal member 7 is slight ly pressed toward the opposing stationary member 8, by means of a thrust-spring 10' interposed between a set screw 9, inserted in a lateral bore through the side wall of the channel, and the outer face of the movable member 7. The set screw 9 lies wholly inside the wall of the shuttle and is provided, at its inner end, or boss penetrating the helical spring to aid in positioning the latter. The tension may be easily varied by turning the adjusting screw 9 farther inward or outward, it is desired, to increase or diminish the tension on the yarn.

In case it is preferred to effect the adjust-v ment of the yarn tension through the bottom instead of through the side wall of the with a small projection shuttle, I provide a modified form of movend of the projection or arm 17 so as to press the arm inward yieldingly to produce,

able member, as shown in Figures 4, 5 and 6. In this case the vertical portion 17 of the movable member is, in all essential respects, like the movable member 7 but it is provided on its outer face with an extension or arm 17 extending horizontally the same effect as in the form previously described.

'The base 6 of the tensioning member is 1 7 held against both torsional and vertical distoward an pression placement by means of an anchoring pin 6*, driven transversely through that portion of the shuttle which receives the. base so to engage the transverse groove or notc formed in the forward portion of said base.

What I claim is:

1. In a loom shuttle, the combination with a shuttle body whose forepart is provided with a 'medial longitudinal yarn-channel having communication with a thread-eye of threading members overhanging said channel, yarn-tensioning means located in the rear portion of said channel and embracing an upright post secured in a socket in the bottom of the channel, a-tensi-oning jaw pivotally mounted thereon to swing about, a longitudinal fulcral pin supported by said post in a lane-transversely of the shuttle away from said post, a comspring mounted in a recess in the bottom of the shuttle to exert pressure against said pivoted jaw, and an adjusting inward P j ion to-overhang the intery posed yarn and prevent its escape from the space between the post and the-jaw during 7 the weaving operation.

3. A yarn-tenslonlng device for a selfthreading shuttle embracing a vertical. post and having its base portion secured in a socketin the bottom of the longitudinal thread. channel of the shuttle, said post be-' ing rounded on its inner side an opposing vertical jaw vfulcrumed in said base to swing about an axis lengthwise of the shuttle toward andaway from the post, said jaw being vertically concaved to partly fitv around the inner side of the post, means for preventingthe escape of the yarn from r the space between the post and the jaw while guiding the yarn during the threading operation into such space,- spring mounted in a transverse-bore of the a tensioningv shuttle body, and a spring-oompresslon adjusting screwfm'o'unted in said recess to vary the"; compression of the spring, substantially as described.

Inwitness whereof, I above specification.

I GEORGE M. onnnnr have subscribed 

